feat: add KnowledgeGraph component for visualizing, editing, and syncing handbook content with AI-driven analysis

src/components/admin/KnowledgeGraph.jsx

@@ -28,8 +28,19 @@ const KnowledgeGraph = () => {
   const [relations, setRelations] = useState([]);
 
   const reloadKb = useCallback(() => {
-    db.getTopics().then(setTopics);
+    Promise.all([db.getTopics(), db.getRelations()]).then(([allTopics, allRelations]) => {
-    db.getRelations().then(setRelations);
+      const topicIds = new Set(allTopics.map(t => t.id));
+      const validRelations = allRelations
+        .map(r => ({
+          ...r,
+          source: r.source?.id || r.source,
+          target: r.target?.id || r.target
+        }))
+        .filter(r => topicIds.has(r.source) && topicIds.has(r.target));
+      
+      setTopics(allTopics);
+      setRelations(validRelations);
+    });
   }, []);
 
   useEffect(() => {
@@ -164,7 +175,13 @@ const KnowledgeGraph = () => {
   const deleteNode = async () => {
     if (confirm(`Are you sure you want to delete "${selectedNode.label}"? This will also remove any relations connected to it.`)) {
       const updatedTopics = topics.filter(t => t.id !== selectedNode.id);
-      const updatedRelations = relations.filter(r => r.source !== selectedNode.id && r.target !== selectedNode.id);
+      const updatedRelations = relations
+        .map(r => ({
+          ...r,
+          source: r.source?.id || r.source,
+          target: r.target?.id || r.target
+        }))
+        .filter(r => r.source !== selectedNode.id && r.target !== selectedNode.id);
 
       await db.saveTopics(updatedTopics);
       await db.saveRelations(updatedRelations);
@@ -324,7 +341,19 @@ Analyze this graph and return ONLY the optimized JSON object with this EXACT str
         }
       }
 
-      updatedRelations = updatedRelations.filter(r => r.source !== r.target);
+      // Ensure all relations only reference existing nodes and are normalized to string IDs
+      const finalTopicIds = new Set(updatedTopics.map(t => t.id));
+      updatedRelations = updatedRelations
+        .map(r => ({
+          ...r,
+          source: r.source?.id || r.source,
+          target: r.target?.id || r.target
+        }))
+        .filter(r => 
+          r.source !== r.target && 
+          finalTopicIds.has(r.source) && 
+          finalTopicIds.has(r.target)
+        );
 
       await db.saveTopics(updatedTopics);
       await db.saveRelations(updatedRelations);